Invertebrates

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Across
  1. 2. social winged insect that has a narrow waist and a sting
  2. 4. symmetry around a central axis
  3. 5. an external skeleton
  4. 8. primitive sedentary aquatic invertebrate with a soft porous body
  5. 11. animals without a backbone or bony skeleton
  6. 13. a mollusk with a single spiral shell
  7. 15. free-swimming marine coelenterate with a gelatinous bell- or saucer-shaped body
  8. 18. symmetry having a body displaying two similar halves
  9. 19. one hundred feet
  10. 20. invertebrate generally shaped like a star polygon
Down
  1. 1. a nectar-feeding insect with two pairs of large, typically brightly colored wings
  2. 3. eight-legged predatory arachnid
  3. 6. an elongated, fast-swimming cephalopod mollusk with ten arms
  4. 7. Cold blooded
  5. 9. chiefly nocturnal insect related to the butterflies
  6. 10. organism that is permanently attached to a surface
  7. 12. external skeleton
  8. 14. having a body displaying a disproportion between two or more parts
  9. 16. a tough-skinned terrestrial mollusk which typically lacks a shell and secretes a film of mucus for protection
  10. 17. Firm tissue that provides flexible support in animal skeletons.